invalidate cache

Jens,

I have a sync read testing with fio. Parameter loops=3 means
repeating the read for 3 times. I want to invalidate the page cache
before the testing, but keep cache among the loops.

If the files already exist before testing, I could drop cache by
/proc/sys/vm/drop_caches. But if the files don't exist, fio will create
them. So if I set invalidate=0, the cache will be kept before the real testing.

Is it possible to drop file cache in function extend_file if the file is
extended? I mean, just drop the extended length?

Thanks,
Yanmin
Received on Wed Apr 02 2008 - 07:11:34 CEST